Usually it's something small like a glove or a cell phone.
But now, an artist is trying to figure out what happened to two of his valuable paintings he left in a taxi.
Renelio Marin took a yellow cab to his Upper East Side apartment last week after showing his work at a café in Harlem.
But he'd left two of his most important pieces inside the cab.
He found his cab receipt but couldn't track down the paintings.
The paintings depict breakdancers and are valued at between $2,000 and $2,500 each.
Marin is working with the Taxi and Limousine commission to track down the paintings.
If any one finds the missing paintings they're asked to drop them off at one of the TLC's designated lost property police precincts.
Designated Lost Property Police Precincts
Manhattan
17th Precinct
167 E. 51st Street
212.826.3211
212.826.3212
212.826.3246
Central Park Precinct
86th Street & Tranverse Road
212.570.4821
Brooklyn
76th Precinct
191 Union Street
718.834.3211
94th Precinct
100 Meserole Avenue
718.383.3879
Queens
107th Precinct 71-01 Parsons Blvd
718.969.5100
115th Precinct
92-15 Northern Blvd
718.533.2002
Bronx
43rd Precinct
900 Fteley Avenue
718.542.0888
Staten Island
120th Precinct
78 Richmond Terrace
718.876.8500